Jane Krakowski's pregnancy will not be incorporated into a story line on "30 Rock," the NBC comedy series she has starred in since it began in 2006.
The 42-year-old actress, who plays Jenna Maroney on the show, showcased her baby bump at the recent 2011 Golden Globe Awards.
NBC has not commented on how her pregnancy will affect the show. Krakowski is due to give birth in April, the magazine said.
"Her character would be the worst mother in the world," "30 Rock" creator and actress Tina Fey told Seacrest. "I think the state would come to the show and take her fake baby away."
Krakowski announced earlier this month that she and fiance Robert Godley, a fashion designer, are expecting their first child. She is due to give birth in April.
Before "30 Rock," Krakowski played Elaine on the drama-comedy series, "Ally McBeal."